NEW YORK - Austria's Dominic Thiem finally claimed his first Grand Slam title with a stunning comeback to beat Germany's Alexander Zverev 2-6 4-6 6-4 6-3 7-6(6) in Sunday's US Open final.

The 27-year-old world number three, beaten in his first three Grand Slam finals, started as favourite but appeared to have blown his golden chance as he fell two sets behind.

Thiem, who had dropped only one set en route to the final, looked stifled by nerves early on but gradually broke the shackles to hit back from a break down to take the third.